Resin compositions

Abstract

A resin composition, a shaped article, a fiber, a film and a sheet. The resin composition includes two or more kinds of polyolefin resins (A), and 0.05 to 10 mass % of an α-olefin (co)polymer (B) satisfying requirements (b-1) to (b-3): (b-1) A methyl group index is 40 to 60%. The methyl group index is a ratio of an integral of a peak observed in a range of 0.50 to 1.15 ppm to an integral of peaks observed in a range of 0.50 to 2.20 ppm in a 1 H-NMR spectrum of a solution of the (co)polymer (B) in deuterated chloroform, positions of the peaks being calculated relative to a solvent peak at 7.24 ppm assigned to CHCl 3 in deuterated chloroform as a reference. (b-2) A weight average molecular weight determined by GPC is 1,500 to 20,000. (b-3) No melting point is observed from −100 to 150° C. in DSC.

1 . A resin composition comprising:
 two or more kinds of polyolefin resins (A); and   an α-olefin (co)polymer (B) satisfying requirements (b-1) to (b-3) described below,   a content of the α-olefin (co)polymer (B) being 0.05 to 10 mass %,   (b-1) a methyl group index is 40 to 60% wherein the methyl group index is a ratio of an integral of a peak observed in a range of 0.50 to 1.15 ppm to an integral of peaks observed in a range of 0.50 to 2.20 ppm in a  1 H-NMR spectrum of a solution of the α-olefin (co)polymer (B) in deuterated chloroform, positions of the peaks being calculated relative to a solvent peak at 7.24 ppm assigned to CHCl 3  in deuterated chloroform as a reference,   (b-2) a weight average molecular weight determined by gel permeation chromatography is 1,500 to 20,000,   (b-3) no melting point is observed at temperatures ranging from −100 to 150° C. in differential scanning calorimetry.   
     
     
         2 . The resin composition according to  claim 1 , wherein the content of the α-olefin (co)polymer (B) is 0.5 to 6 mass %. 
     
     
         3 . The resin composition according to  claim 1 , wherein the weight average molecular weight of the α-olefin (co)polymer (B) is 1,500 to 14,000. 
     
     
         4 . The resin composition according to  claim 1 , wherein the polyolefin resins (A) include an ethylene resin and a propylene resin. 
     
     
         5 . The resin composition according to  claim 1 , wherein the polyolefin resins (A) include an ethylene resin and a propylene resin, and
 contents of the ethylene resin and of the propylene resin are 1 to 20 mass % and 80 to 99 mass %, respectively, based on the total thereof taken as 100 mass %.   
     
     
         6 . The resin composition according to  claim 1 , wherein the polyolefin resins (A) include an ethylene resin and a propylene resin, and
 contents of the ethylene resin and of the propylene resin are 2 to 10 mass % and 90 to 98 mass %, respectively, based on the total thereof taken as 100 mass %.   
     
     
         7 . A method for producing a resin composition, comprising a step of mixing:
 two or more kinds of polyolefin resins (A); and   an ethylene/α-olefin copolymer (B′) produced by a process (α) described below and satisfying requirements (b-1) to (b-3) described below, the copolymer (B′) being added so that the content thereof is 0.05 to 10 mass %,   (b-1) a methyl group index is 40 to 60% wherein the methyl group index is a ratio of an integral of a peak observed in a range of 0.50 to 1.15 ppm to an integral of peaks observed in a range of 0.50 to 2.20 ppm in a  1 H-NMR spectrum of a solution of the copolymer (B′) in deuterated chloroform, positions of the peaks being calculated relative to a solvent peak at 7.24 ppm assigned to CHCl 3  in deuterated chloroform as a reference,   (b-2) a weight average molecular weight determined by gel permeation chromatography is 1,500 to 20,000,   (b-3) no melting point is observed at temperatures ranging from −100 to 150° C. in differential scanning calorimetry,   the process (α): a process comprising a step of polymerizing ethylene and an α-olefin by solution polymerization in the presence of a catalyst system comprising:
 a bridged metallocene compound (a) represented by the formula 1, and 
 at least one compound (b) selected from the group consisting of organoaluminum oxy compounds (b1) and compounds (b2) capable of reacting with the bridged metallocene compound (a) to form an ion pair, 
   
       
         
           
           
               
               
           
         
         [in the formula 1, R 1 , R 2 , R 3 , R 4 , R 5 , R 8 , R 9  and R 12  are each independently a hydrogen atom, a hydrocarbon group or a silicon-containing hydrocarbon group and a plurality of these groups that are adjacent to one another may be linked together to form a ring structure, 
         R 6  and R 11  are the same as each other and are hydrogen atoms, hydrocarbon groups or silicon-containing hydrocarbon groups, 
         R 7  and R 10  are the same as each other and are hydrogen atoms, hydrocarbon groups or silicon-containing hydrocarbon groups, 
         R 6  and R 7  may bond to a C2-C3 hydrocarbon to form a ring structure, 
         R 10  and R 11  may bond to a C2-C3 hydrocarbon to form a ring structure, 
         R 6 , R 7 , R 10  and R 11  are not hydrogen atoms at the same time; 
         Y is a carbon atom or a silicon atom; 
         R 13  and R 14  are each independently an aryl group; 
         M is Ti, Zr or Hf; 
         Q independently at each occurrence is a halogen atom, a hydrocarbon group, an anionic ligand or a neutral ligand capable of coordinating to a lone electron pair; and 
         j is an integer of 1 to 4]. 
       
     
     
         8 . A shaped article formed from the resin composition according to  claim 1 . 
     
     
         9 . A fiber formed from the resin composition according to  claim 1 . 
     
     
         10 . A film formed from the resin composition according to  claim 1 . 
     
     
         11 . A sheet selected from a sheet formed from the resin composition according to  claim 1 . 
     
     
         12 . A sheet comprising the fiber according to  claim 9 . 
     
     
         13 . A sheet comprising the film according to  claim 10 .